Answers:
Yes because otherwise someone else could effortlessly sit down and hit the spinal column button on your browser to return to your safe and sound session.
Your password and esteemed facts may be transmitted if it is wide open
If your computer is with the sole purpose used by you and protected than no it's not a big traffic.
But if near's even one other soul using your computer you should because if you don't the subsequent personage using the browser may own access to personal information.